Hubert henry grenfell



` (No Model.)`

G. ACCLES.

. as l UNITED STATES HUBERTHENRY GRENFELL, or LoNDoN,-.AND JAMES GEORGE AooLEs, or y PATENT* OFFICE.

BIRMINGHAM, ENGLAND.

PaoJEc-rILl-z.

SPECIFICATION forming part of Letters Patent No. 486,598` dated November 22, 1892. j

Application filed DeoemberlQ, 1891. Serial No. 415,680. (No model.) l

To all whom it may concern.'

Beit known that we, HUBERT HENRY GREN- FELL, captain Royal Navy, a subject of the Queen of Great Britain, and a residentldfLon# don, England, and JAMES GEORGE ACCLES, engineer, a citizen of the United Sta-tesof America, and residing at Birmingham, E ngland, have invented certain new-and. useful or otherwise formed'wth its rear. end open.

and is then provided with a separately-formed base or plug inserted and secured-'inthe 'ap-p.'

:o erture existing in the said open end. Heretofore. in the manufacture of such projectiles it has been 'customary to secure the base or plugin the shell-body by screwing it into the said aperture, and in t-he specification of a re' cent British patent, No. 11,616, A. D. 1890, it is proposed to close the end ofthe shell-body down over a screw ring or bushing. The method of attachment by screw-threads is, however, objectionable, for the reason that 3o the surfaces of the screw-threads form inclines or wedges, which by the pressure exerted on the base in the discharge of the gun act to open or expand the rear portion of the circumferential wall of the projectile. The deformation caused by such expansion gives rise to undue friction between thesurfaces `of the projectile and the bore of the gun and to irnperfect centering of the projectile therein, the result being more or lessinaccuracy in the 4o shooting. Moreover, the said wedging and expanding action is increased when the shell strikes an object--such as an armor-plate, for

instance-and shells frequently break in the armor by reason of the excessive friction .of

+5 the expanded and enlarged base or rear end,

and therefore fail to completely perforate the armor-plate and to burst effectively behind it.

Now according to our invention we obviate this diioulty and greatly improve the manu- 5.o facture of such projectiles as follows-that is to say: Instead of using a screwed ring or bush` and securing the same by screwing it into the end of the shell-body and closing the end `of the shell-body over it we make the aperture and' the plug or bushing plain or smooth and secure the said plug or bushing in the said aper-turein such -a manner that there will be 11o wedging or expansive action of the plug uponthe body of the projectile. y j

- In order that our invention may be clearly understoodwe will now proceed to describe with reference to the accompanying drawings the manner in which we carry it into effect. l Figure l shows in transverse section the rear end of a projectile ready for the 4insertion of the base or bushing according to our invention.

Fig. 2 represents a longitudinal central section fl a finished projectile with the base or bushing ,in place therein. Fig.3 .isa iongitudinal central section of the base or bushing apart'from the projectile, and Fig. et shows the outer face of the bushing.

Similar letters of reference indicatecorrespending partsin all the figures.

Ais the shell-body. Bis an aperture in the rear end of the said shell-body of somewhat larger diameter than the cavity C therein, so

that at the inner end of the said aperture there is a circular ledge or shoulder D, where on the,base,nbushing, or plug E is supported. The sides of the aperture formingitscircumference are parallel, as are the corresponding sides of the plug E, which come into contact therewith. i y

F is a seating formed upon the plug E to tit closely to the saidledge or shoulder D. The surface of the said ledge or shelf is at right angles with the principal axis of the projectile or is inclined toward the said axis and the rearof the projectile.

G G are shallow grooves formed in the outer face of the plug.. p

H is a screw-threaded opening formed in the plugE to receive a fuse.

I i'sa driving-ring'and gas-check.

W'e preferably form vthe plug or bushing E with its rear orv outer end somewhat curved or-rounded, as shown. lThe grooves Gare pro vided upon the said -bush or plugin order that when the same is insertedin the apertoo ture B the end of the shell-body which extends beyond-the end of the base or plug may be closed down or forced down over the said base or plug into the positions in which it is shown in Fig. l.y Sonie portions of the metal thus forced down willenter the shallowgrooves G, and the plug is thereby very firmly'and solidly secured in its place. The said grooves, moreover,` prevent any twisting or turning of the base or plug E while being screwed to receive the fuse.

This method of manufacture not only insures freedom from any tendency to expansion and deformation of the shell-body when the gunis fired and when the shell strikes an object, butit. insures great regularity and ac-.

curacy in respect of the dimensions and weight of the completed projectile. The term plug as used in the claims includes any equivalent form of base or bushing.

lvVhat we claim is- 1. A hollow projectile provided with a plug 1 near its rear end, having grooves on its outer face, the body of said projectile being provided with a fiange upset over said plug and into the grooves thereof.

2. A hollow projectile provided with an enlarged chamber at its rear end, havingshoulders at the inner portion of said enlarged chamber, a.plug Within said chamber, abuthaving a screw-threaded opening extending therethrough. 4. A hollow projectile provided with an enlarged chamber at its rear end, having shoulders at the inner portion of said enlarged chamber, a plug Within said chamber, abutting against said shoulders and provided with grooves on its outer face, the bodyot' said projectile being provided with a flange upset over said plug andinto the grooves thereof, clamping the plug against said shoulders. y

In testimony whereof we have hereunto signed our names in the presence of two subscribing witnesses. I

HUBERT HENRY GRENFELL. JAMES GEORGE ACCLES. Witnesses:

JNO. FREDK. PARKES. ERNEST HARKER. 

